APCBagOStuff.php

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<?php
class APCBagOStuff extends BagOStuff {
        public function get( $key, &$casToken = null ) {
                $val = apc_fetch( $key );

                $casToken = $val;

                if ( is_string( $val ) ) {
                        if ( $this->isInteger( $val ) ) {
                                $val = intval( $val );
                        } else {
                                $val = unserialize( $val );
                        }
                }

                return $val;
        }

        public function set( $key, $value, $exptime = 0 ) {
                if ( !$this->isInteger( $value ) ) {
                        $value = serialize( $value );
                }

                apc_store( $key, $value, $exptime );

                return true;
        }

        public function cas( $casToken, $key, $value, $exptime = 0 ) {
                // APC's CAS functions only work on integers
                throw new MWException( "CAS is not implemented in " . __CLASS__ );
        }

        public function delete( $key, $time = 0 ) {
                apc_delete( $key );

                return true;
        }

        public function merge( $key, closure $callback, $exptime = 0, $attempts = 10 ) {
                return $this->mergeViaLock( $key, $callback, $exptime, $attempts );
        }

        public function incr( $key, $value = 1 ) {
                return apc_inc( $key, $value );
        }

        public function decr( $key, $value = 1 ) {
                return apc_dec( $key, $value );
        }
}